Chemical and water feed mechanism for steam-boilers.



PATENTED JUNE 11, 1907.

.R. H. FETTA. GHBMIGAL AND WATER FEED MECHANISM FOR STEAM B OILERS.

APPLICATION FILED JAN. 22, 1907.

UNITED STATES ROBERT H. FETTA, OF RICHMOND, INDIANA,

PATENT or ies.

ASSIGNOR TO THE FETTA IVATER SOFTENICR COMPANY, OF RICHMOND, INDIANA, A CORPORATION OF INDIANA.

Specification of Letters Patent.

Patented June 11, 1907.

A lication fil d January 22,1907. Serial No. 853,513.

1'0 (LU 111710111. it may curate/'72 Be it known that I, Honmrr II. FET'IA, a citizen of the United States, residing at Richmond, in the county of IVayne and State of Indiana, have invented certain new and useful Improvements in Chemical and Water Feed Mechanism for Steam-Boilers; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the figures and letters of refer ence marked thereon.

This invention relates to the feed mechanism of steam boilers, the objects being to provide means whereby a definite quantity of chemical may be combined with the feed water as the latter moves toward the boiler; to provide means whereby the feed pipe and valves therein may be effectually cleaned by a reverse flow or blowing-off action and to so arrange the chemical supply and feed water connections that no deposit will take place in the chemical supply connections and no permanent deposit can accumulate in the feed water connections thereby eliminating the danger of accidents primarily due to these causes.

A further object of the invention is to pro vide a simple arrangement of fittings and connections which will be automatic in action and require only the ordinary manipulation of valves for regulation. of the chemical supply and for cleaning or blowing out accumulations.

The accompanying drawing is an elevation partly in section and partly diagran'imatic, of a mechanism embodying the present improvements.

In said drawing, the boiler is shown diagrammatically at A and at a proper point it is provided with a feed water pipe connection as at B. The pipe B with certain fittings and connections to be presently described, is preferably, though not necessarily substantially straight and terminates at a blow-off C controlled by a blow-off valve C. Between the blow-off valve and boiler the feed water pipe or branch D from a pump or other suitable source enters through a union or curved elbow connection D, a check valve E being located at the point of entry for preventing back flow to the pump.

In the preferred arrangement a special :fitting F is interposed in the pipe B at the point where the feed water enters the same and this special fitting forms the chamber for the check valve. Said check valve E is preferably a pivoted flap valv'c adapted to close on its seat at an angle to the body of the fitting and when open to leave a practically unobstructed passage for the entering water conforming to the general curvature of the elbow and merging gradually into the straight opening through the fitting.

The compost or chemical chamber II is usually mounted on the fitting F, and is itself in all essential particulars substantially similar to the compost or chemical chamber of my prior patent Nb. 823,94], dated June 19, 1906. From one side of the lower portion of the compost chamber a pipe or duct embodying a sight feed I leads to the feed pipe or main passage through the fitting I and a valve I is provided. in said. pipe or d not for regulating the quantity of chemical allowed to pass into the feed water. From the opposite side of the compost chamber, a pipe Ii leads to the steam space of the boiler or to a steam line for supplying pure water of condensation to the compost chamber for dissolving the chemical. The latter as in my aforesaid patent, is preferably in the form of a solid stick. A valve K is interposed in the compost chamber water pipe b: for controlling the flow theretln'ough. Between the fitting F and the boiler a valve L is located in the feed pipe and from a point between. the said valve and boiler a branch or bypass M leads back to the fitting F and opens into the latter in position to sweep the check valve, its seat and chamber clean whenever back flow is directed through the bypass. The by-pass is controlled by a valve N and while these parts together with others are shown as ordinary couplings, nipples etc. it is obvious that special fittings en'ibodying the necessary passages and valves may be employed if so desired.

In operation, the chemical is placed in the compost chamber and the latter closed. The blow-off valve C is normally closed and the valve I} open to permit of the feeding of water to the boiler as desired. Valves II and I are opened sufficiently to permit the desired percentage of chemical to enter the feed pipe and cornmingle with the feed water. Pure water of condensation in the pipe K will create a sul'licient preponderance of pressure to cause the desired flow through the bottom of the compost chamber, but owing to the fact that the water is pure, no deposit or precipitation will take place, in the compost chamber connections and these will therefore remain clear and the flow through them unimpaired As the impure feed water is first subjected. to the action of the chemical in the feed Water pipe, precipitation takes place rapidly in the latter, the deposit at first being in a soft mushy-like condition but if allowed to remain hardens and results in the formation of a permanent deposit. To overcome this the feed water pipe and connections are blown out periodically, say once every day and to do this it is only necessary to open the blow-off valve C. T he reverse flow at boiler pressure will clean out the whole feed water pipe above the check valve. While the check valve itself will ordinarily be effectually cleaned by the simple opening of the blow-oil valve, it may be still further cleaned by closing the intermediate or emergency valve L and opening the by-pass valve N thereby sweeping the valve, its seat and chamber with the whole boiler pressure, flowing through the by-pass. By closing the blow-oft and by-pass valves and opening the intermediate or emergency are restored to condition for feeding water to the boiler and with all the connections and valves clean and tree from deposit.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a water and chemical feed for steam boilers the combination with the feed pipe having two branches one a water inlet and valve the partsthe other a blow-oil, a check valve in the water inlet branch and a blow-off valve in the blow-ofl' branch, of a compost chamber, a duct leading from the chamber to the teed pipe between said valves and the boiler, and a condensed water and steam pipe leading from the compost chamber to the boiler substantially as described.

'2. in a feed for steam boilers, the combination with the feed pipe having two branches, one a water supply and the other a blow otl' and separate valves in said branches and feed pipe respectively, of a by-pass for the valve in the feed pipe opening in position to clean the valve in the water supply branch when the blow-otl is open; substantially as described.

8. In a feed for steam boilers, the combination with the feed pipe having a blow-oft discharge and valve therefor and a water "r'eed branch entering the feed pipe between the blow-off valve and boiler, of a check valve located at the feed pipe end of the w ater feed. branch for closing the latter and in position to-be cleaned by the reverse flow in blowing oil substantially as described.

4. In a feed. for steam boilers, the combination with the feed pipe having a blow-off discharge and valve therefor and a water feed branch enterin the feed i e between.

the blow-oft valve and boiler, of a check valve located at the teed pipe end of the water teed branch, a compost chamber communicating with the feed pipe for supplying chemical and a water supply pipe leading to the compost chamber; substantially described.

ROBERT H. FETTA. WVitnesses:

J. P. FULGHAM, G. ITIEATH. 

